Usually that means there the clock used to update the fileystem superblock is not in sync with the system/bios clock, probably off by UTC vs. timezone. So its possible that during the install, your clock is set several hours ahead of your system/bios clock upon reboot. The liveMEDIA is not supposed ...

New MX Linux fan here... A few days ago I installed MX17 on a 64GB USB sick, with root persistence. It works great. Fast when run from RAM. I've tested the waters with other distros on persistent sticks, and MX17 is the first that seems to be stable enough to work really well and be reliable enough...